Boating Skills And Seamanship Copyright Coast Guard Auxiliary Association, Inc. 14th ed. 1 Weather And Boating Chapter 12 Copyright Coast Guard Auxiliary Association, Inc. 14th ed.

Boating Skills And Seamanship Copyright Coast Guard Auxiliary Association, Inc. 14th ed. 2 Weather And Boating Chapter 12

Boating Skills And Seamanship Copyright Coast Guard Auxiliary Association, Inc. 14th ed. 3 Lesson Objectives Weather information sources Basic storm patterns Storm forecasting and precautions Go/No Go decision making Personal weather check list

Boating Skills And Seamanship Copyright Coast Guard Auxiliary Association, Inc. 14th ed. 4 Weather Information NOAA/NWS Surface Analysis Interactive Weather buoys US Winds Jet Stream AccuWeather Intellicast Weather Underground Local cams

Boating Skills And Seamanship Copyright Coast Guard Auxiliary Association, Inc. 14th ed. 5 Wind and Boating

Boating Skills And Seamanship Copyright Coast Guard Auxiliary Association, Inc. 14th ed. 6 Winds and Boats What are the factors affecting winds? High and low pressure systems Fronts – the intersections of air masses Warm – usually clouds & rain, but little wind Cold – often mean dramatic wind shifts, strong gusts, storms This is where most severe weather occurs Heat – buildup of heat over the earth causes air to rise, water condenses as rain Land breeze/sea breeze – caused by heat differential between land & sea

Boating Skills And Seamanship Copyright Coast Guard Auxiliary Association, Inc. 14th ed. 7 Winds and Waves Copyright Hal Roth, 2006, reprinted with permission What are factors that determine characteristics of waves? Wind strength Fetch - distance over water that wind travels Deep water - larger, longer waves Shallow water - short, steep waves Current - wind against current means short, steep waves

Boating Skills And Seamanship Copyright Coast Guard Auxiliary Association, Inc. 14th ed. 8 Understanding Weather Weather and heat Land and sea breezes Reprinted with permission from Gary Jobson ’ s Championship Sailing by Gary Jobson

Boating Skills And Seamanship Copyright Coast Guard Auxiliary Association, Inc. 14th ed. 9 Understanding Weather Earth’s major wind patterns: What major wind pattern are we in? These patterns shift with the seasons and are only general in nature

Boating Skills And Seamanship Copyright Coast Guard Auxiliary Association, Inc. 14th ed. 10 Understanding Weather Low pressure systems rotate counterclockwise (in N Hemisphere) High pressure systems rotate clockwise (in N Hemisphere)

Boating Skills And Seamanship Copyright Coast Guard Auxiliary Association, Inc. 14th ed. 11 Understanding Weather Low pressure systems often produce inclement weather Dramatic wind shifts High winds/thundersotrms Waves High pressure systems are associated with fair weather

Boating Skills And Seamanship Copyright Coast Guard Auxiliary Association, Inc. 14th ed. 12 Understanding Weather Buys Ballot’s Law

Boating Skills And Seamanship Copyright Coast Guard Auxiliary Association, Inc. 14th ed. 13 Understanding Weather Front Symbols Warm front Cold front Stationary front warm front cold front stationary front

Boating Skills And Seamanship Copyright Coast Guard Auxiliary Association, Inc. 14th ed. 14 Three types of clouds: High Level – Cirrus, Cirrocumulous, Cirrostratus Mid Level – Altocumulus, Altostratus Low Level – Stratus, Stratocumulus, Cumulus, Nimbostratus, Cumulonimbus Types of Clouds

Boating Skills And Seamanship Copyright Coast Guard Auxiliary Association, Inc. 14th ed. 15 Understanding Weather Weather clues from clouds Cold fronts often begin with cirrus clouds, followed by lowering altostratus, then cumulus and cumulonimbus (thunderheads) Frontal passage brings wind shift SW to NW, (sometimes strong and sudden) Warm fronts are usually preceded by mid-level clouds, lowering to low level stratus, with rain

Boating Skills And Seamanship Copyright Coast Guard Auxiliary Association, Inc. 14th ed. 16 Understanding Weather

Boating Skills And Seamanship Copyright Coast Guard Auxiliary Association, Inc. 14th ed. 17 Understanding Weather Approaching low Approaching warm front Passing warm front Within warm sector Approaching cold front Passing cold front

Boating Skills And Seamanship Copyright Coast Guard Auxiliary Association, Inc. 14th ed. 18 Student Activity Clouds associated with fronts Cirrus Stratus Cumulus 1 2 3

Boating Skills And Seamanship Copyright Coast Guard Auxiliary Association, Inc. 14th ed. 19 Restricted Visibility Fog—a cloud on the earth’s surface Advection fog - Warm moist air over cold water Radiation fog – moist air over cooling land-may extend out to sea Frost smoke - very cold air over warm water Smog – A combination of atmospheric pollution and condensed moisture Haze – Combination of dust particles, atmospheric moisture, smoke

Boating Skills And Seamanship Copyright Coast Guard Auxiliary Association, Inc. 14th ed. 20 Fog Precautions Precautions must be taken in fog Slow down! Keep careful lookout Listen to radio Use radar Use chart Navigate!

Boating Skills And Seamanship Copyright Coast Guard Auxiliary Association, Inc. 14th ed. 21 Should have slowed down… Adapted from Boater’s Bowditch by Rickard K. Hubbard

Boating Skills And Seamanship Copyright Coast Guard Auxiliary Association, Inc. 14th ed. 22 Non-Frontal Weather Thunderstorms Can be dangerous High winds, rapid shifts Waves can develop rapidly May presage cold front May pass quickly and harmlessly May form waterspouts Reprinted with permission from Boater’s Bowditch by Richard K. Hubbard

Boating Skills And Seamanship Copyright Coast Guard Auxiliary Association, Inc. 14th ed. 23 Lightening Thunderstorms Microbursts Tornadoes Waterspout Tornado over the water Usually short-lived Dangerous if you’re too close

Boating Skills And Seamanship Copyright Coast Guard Auxiliary Association, Inc. 14th ed. 24 Non-Frontal Weather If you are caught in a thunderstorm Have each person don a life jacket Pin point your location Keep a sharp lookout Reduce speed Head into the wind and 45° to waves Secure hatches and ports Stow all gear Stay low in the boat Keep away from metal objects

Boating Skills And Seamanship Copyright Coast Guard Auxiliary Association, Inc. 14th ed. 25 Non-Frontal Weather Tropical Storms Tropical wave or depression Tropical Cyclone Hurricane

Boating Skills And Seamanship Copyright Coast Guard Auxiliary Association, Inc. 14th ed. 26 The Go/No-Go Decision

Boating Skills And Seamanship Copyright Coast Guard Auxiliary Association, Inc. 14th ed. Thank you Illustrations provided by McGraw Hill Education 27 The